title: Preconversion phase modulation of input differential phase-shift-keying signals for wavelength conversion and multicasting applications using phase-modulated pumps.
abstract: We demonstrate a method to use phase-modulated pumps for multicasting of return-to-zero differential phase-shift keying (RZ-DPSK) signals. The method uses phase modulation of the input signal along with the co-phase-modulated pumps prior to wavelength conversion. Nine copies of a 50 Gbit/s RZ-DPSK data signal are generated via four-wave mixing with an average conversion efficiency of ∼0 dB. An average receiver sensitivity penalty of ∼1.9 dB is observed at a bit-error rate of 10(-9) with a worst case of 2.3 dB. The effects of synchronization errors and phase-modulation frequencies up to 5 GHz are investigated.
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA. oyilmaz@usc.edu
authors.forename: Omer F
authors.initials: OF
authors.lastname: Yilmaz
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Salman
authors.initials: S
authors.lastname: Khaleghi
authors.forename: Xue
authors.initials: X
authors.lastname: Wang
authors.forename: Scott R
authors.initials: SR
authors.lastname: Nuccio
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Wu
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner